405256515612 has 72 divisors (see below), whose sum is σ = 1024286780160. Its totient is φ = 124651126080.

The previous prime is 405256515593. The next prime is 405256515617. The reversal of 405256515612 is 216515652504.

405256515612 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405256515617) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6089437 + ... + 6155627.

It is an arithmetic number, because the mean of its divisors is an integer number (14226205280).

Almost surely, 2^405256515612 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 405256515612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (512143390080).

405256515612 is an abundant number, since it is smaller than the sum of its proper divisors (619030264548).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

405256515612 is a wasteful number, since it uses less digits than its factorization.

405256515612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69243 (or 69228 counting only the distinct ones).

The product of its (nonzero) digits is 360000, while the sum is 42.

The spelling of 405256515612 in words is "four hundred five billion, two hundred fifty-six million, five hundred fifteen thousand, six hundred twelve".